If I look at my present configuration and estimate the power, I come up with about 300 BHP. Does this mean that a Hemi in stock form with the advertised power of 345 BHP is faster?

 

You're figuring rear wheel HP is 300? The 345 HP on the Hemi is at the flywheel. With the 6 speed, you won't win a drag race, but you should be able to handle one out on the highway.

 

At top end. All your low end torque would give you a better launch for him to have to make up. With a load, that **** power would only let him reach higher speeds going down hill, so he can coast partially up the next. ;D JMHO

 

[quote author=wannadiesel link=board=8;threadid=23345;start=0#msg219183 date=1070727388]
You're figuring rear wheel HP is 300? The 345 HP on the Hemi is at the flywheel. With the 6 speed, you won't win a drag race, but you should be able to handle one out on the highway.
[/quote]
I am probably using the wrong terms. As much as I want to learn about horsepower terminology, I still get confused. I even went to this link and am still confused http://www.revsearch.com/dynamometer...orsepower.html.

 

Well, I think I can help out with a comparison.

Power (hp) is the amount of work done in a certain amount of time. Work is the amount of force applied along a distance.
So now we take that piano and carry it up to the fifth floor.
The work done is the same whether we take the piano apart or carry it in one peace. This would be 5 pianofloors
(if we take the piano apart in halves we'd see we pass 10 floors with 0.5 pianos)
Since we haven't defined time yet we don't have power. OK, let's say that we haul the piano up there in one minute. This would equal 5 pianofloors per minute.
(All the same if we haul it in one or make 100 pieces of it, as long as the piano is on the fifth floor in a minute it's the same power)

As for your question on racing the hemi: First do not compare flywheel hp to rear wheel hp. Then there is an interesting question- how much of the time during this race will each engine be at it's peak horsepower or close to it. Since you have a manual you won't beat an auto hemi due to the fact that he won't have to lift his right foot.

Just my 2c

AlpineRAM

(PS, you'd beat him on any long distance haul, just because you'd pass him everytime he has to refuel ;D )

 

Rattle rattle you are opening a deep subject when asking about H.P. as you prolly see from the link you posted horsepower is and equation of torque and rpms. these combinations produce powerbands which allows you to take advantage of gearing. Soooo how you are geared vs how what you are racing is geared is a factor the next factor is are we running the race as standing 1/4 mile or from a roll there are many different senarios with different out comes. take an example of the 3.55 gearing vs the 4.10 in comming out of the hole the 4.10 is gonna pull harder same exact Hp change the gearing and get a different outcome.I guess the reason we race is to prove and dis- prove these theroies. My opinion is from the standing 1/4 the Hemi will take you empty. Put 5000 lbs on and you win. I hope I didn't just confuse the subject but any time you ask a who can take who question when the H.P. is close you need to look at all the options.
BTW I didn't look real close at your sig but if you can launch in 4wd at about 2100 you might get the jump on him so you can take better advantage of you boost pressures.

 

I'll give it a rudimentary try.

You encounter an old rusty merry-go-round. The amount of torque you can generate will determine wether or not you can get the merry-go-round moving AT ALL. The amount of horsepower you can generate will determine the maximum speed at which you can get it to rotate.

Appologies to those who understand the concept with scientific precision.

 

What horsepower means is this: In Watt's judgement, one horse can do 33,000 foot-pounds of work every minute. So, imagine a horse raising coal out of a coal mine as shown above. A horse exerting 1 horsepower can raise 330 pounds of coal 100 feet in a minute, or 33 pounds of coal 1,000 feet in one minute, or 1,000 pounds 33 feet in one minute. You can make up whatever combination of feet and pounds you like. As long as the product is 33,000 foot-pounds in one minute, you have a horsepower.

Kinda how its figured up, I got that from the howstuffworks.com web site, the rest of everything for it is on there if your curious.
as far as racing goes, unless ur quick with the heavy duty manuals Auto is the way to race, But then it comes back to how good you are with the manual since if you are talented they can be faster. One thing you can do however with the Manual that you cant the auto is control your RPM band so you can stay at ur peek horse power. If the auto is tuned it could as well but im not sure if the in home tuners are out yet ( superchips and what not) But they might be.

 

Rattle Rattle,

Let me take a stab at it.
First, you mention 300 HP but don't say if it's at the flywheel or rear wheels. Let's assume it's at the flywheel because that's where the Hemi is measured.
Second, the only race that will answer the question about Cummins vs Hemi, in a drag race, is if the two trucks are equiped the same. So let's say they are identical, with automatics, except one is a Hemi and one is a Cummins.
In this case, it seems to me that the Hemi has an advantage and that's where my money will go. It has 45 more horsepower and any race driver is going to be running his rig at or near maximum horsepower RPM as much as possible. Yes the Cummins has more torque, but this is not a torque match it's a speed match.
And there are other advantages that the Hemi has in this scenario: It weighs a lot less than the Cummins and the Cummins has a lot more rotating mass to spin up.
Fortunately, I'm not interested in drag racing, but in pulling power, long life, and fuel mileage. Give me a Cummins any day even if the Hemi proves to be a little faster!!!! And I don't want to be pulling a trailer over the mountains with the engine running a five thousand RPM mile after mile as I watch the gas gauge drop. Give me that locomotive roar.
Wetspirit

 

Lets wait til the Hemi's get 200K miles on them, then play.

 

[quote author=tmiller24 link=board=8;threadid=23345;start=0#msg220122 date=1070896641]
Lets wait til the Hemi's get 200K miles on them, then play.
[/quote]
Yeah!

 

try reading this it may help or not http://www.g-speed.com/pbh/torque-and-hp.html

 

Don't race one. I've raced an auto Hemi before with my comp and he walked on me like it was nothing. All the guy had was exhaust. It was a crew cab short bed 2x4 on 20" wheels. Those things are quick. Don't forget about weight. You outweigh him BIG time. Weight is a big factor in racing. You might pull him off the line with the torque, but I promise you by the top end of first, maybe mid way through second, he'll have you and pass you.

 

seems as though some are not so sure of how fast the hemi is. I guess all you have to do is race one to find out. I have not raced one, but a co-worker has one 4x2 auto quad cab...for stock, they run well.

Be advised.

JKE

 

[quote author=AlpineRAM link=board=8;threadid=23345;start=0#msg219204 date=1070729891]Power (hp) is the amount of work done in a certain amount of time. Work is the amount of force applied along a distance.
So now we take that piano and carry it up to the fifth floor.
The work done is the same whether we take the piano apart or carry it in one peace. This would be 5 pianofloors
(if we take the piano apart in halves we'd see we pass 10 floors with 0.5 pianos)
Since we haven't defined time yet we don't have power. OK, let's say that we haul the piano up there in one minute. This would equal 5 pianofloors per minute.
(All the same if we haul it in one or make 100 pieces of it, as long as the piano is on the fifth floor in a minute it's the same power)[/quote]

I'm not sure what you said here....but I suddenly my back is hurting.

All this talk about moving pianos...